Browse Prior Art Database

Seek Profile Optimization for Silent Actuator Control

IP.com Disclosure Number: IPCOM000123902D
Original Publication Date: 1999-Jul-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Ono, H: AUTHOR [+2]

Abstract

Disclosed is an actuator control method for disk storage devices by optimizing the seek profile to minimize the traveling acoustic noise and power consumption with keeping the access performance. The conventional seek profile aims to minimize the time to reach the target track regardless the skew between the start and the target sectors such as in the figure 1. The up and down slopes in the figure 1 are in near constant acceleration trajectory. The flat top part is in constant velocity mode whose speed is determined by the controller specification. The rest of the time after settling before reaching the target sector is just for waiting. Then the fast actuator traveling speed gives big acoustic noise and large power consumption.

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Seek Profile Optimization for Silent Actuator Control

   Disclosed is an actuator control method for disk storage
devices by optimizing the seek profile to minimize the traveling
acoustic noise and power consumption with keeping the access
performance.  The conventional seek profile aims to minimize the
time to reach the target track regardless the skew between the start
and the target sectors such as in the figure 1.  The up and down
slopes in the figure 1 are in near constant acceleration trajectory.
The flat top part is in constant velocity mode whose speed is
determined by the controller specification.  The rest of the time
after settling before reaching the target sector is just for waiting.
Then the fast actuator traveling speed gives big acoustic noise and
large power consumption.  The introduced method minimizes the peak
velocity by reducing the waiting time before reaching to the target
sector such as in the figure 2, so that the acoustic noise and the
power consumption can be reduced.

   Here, Let the acceleration and deceleration constant Aa>0
and Ad<0, the acceleration time Ta and deceleration time Td.  And
let the settling time Ts, traveling skew time between the start and
the target sectors Tt, the track to track distance L, the current
velocity V. The seek operation follows the procedure in below.
  1.   Referring to the Tt and the L, add 1 spindle revolution
       time to Tt if L is too long to reach during the original
       time Tt even by the fastest access operation.  This is
       decided by referring the table which indicates the
       minimum seek time for variation of the L.  Otherwise,
    ...